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path: root/drivers/usb/phy/phy-mv-usb.c
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-rw-r--r--drivers/usb/phy/phy-mv-usb.c923
1 files changed, 923 insertions, 0 deletions
diff --git a/drivers/usb/phy/phy-mv-usb.c b/drivers/usb/phy/phy-mv-usb.c
new file mode 100644
index 000000000000..6872bf0a3681
--- /dev/null
+++ b/drivers/usb/phy/phy-mv-usb.c
@@ -0,0 +1,923 @@
1/*
2 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
3 * Author: Chao Xie <chao.xie@marvell.com>
4 * Neil Zhang <zhangwm@marvell.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/io.h>
16#include <linux/uaccess.h>
17#include <linux/device.h>
18#include <linux/proc_fs.h>
19#include <linux/clk.h>
20#include <linux/workqueue.h>
21#include <linux/platform_device.h>
22
23#include <linux/usb.h>
24#include <linux/usb/ch9.h>
25#include <linux/usb/otg.h>
26#include <linux/usb/gadget.h>
27#include <linux/usb/hcd.h>
28#include <linux/platform_data/mv_usb.h>
29
30#include "phy-mv-usb.h"
31
32#define DRIVER_DESC "Marvell USB OTG transceiver driver"
33#define DRIVER_VERSION "Jan 20, 2010"
34
35MODULE_DESCRIPTION(DRIVER_DESC);
36MODULE_VERSION(DRIVER_VERSION);
37MODULE_LICENSE("GPL");
38
39static const char driver_name[] = "mv-otg";
40
41static char *state_string[] = {
42 "undefined",
43 "b_idle",
44 "b_srp_init",
45 "b_peripheral",
46 "b_wait_acon",
47 "b_host",
48 "a_idle",
49 "a_wait_vrise",
50 "a_wait_bcon",
51 "a_host",
52 "a_suspend",
53 "a_peripheral",
54 "a_wait_vfall",
55 "a_vbus_err"
56};
57
58static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
59{
60 struct mv_otg *mvotg = container_of(otg->phy, struct mv_otg, phy);
61 if (mvotg->pdata->set_vbus == NULL)
62 return -ENODEV;
63
64 return mvotg->pdata->set_vbus(on);
65}
66
67static int mv_otg_set_host(struct usb_otg *otg,
68 struct usb_bus *host)
69{
70 otg->host = host;
71
72 return 0;
73}
74
75static int mv_otg_set_peripheral(struct usb_otg *otg,
76 struct usb_gadget *gadget)
77{
78 otg->gadget = gadget;
79
80 return 0;
81}
82
83static void mv_otg_run_state_machine(struct mv_otg *mvotg,
84 unsigned long delay)
85{
86 dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
87 if (!mvotg->qwork)
88 return;
89
90 queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
91}
92
93static void mv_otg_timer_await_bcon(unsigned long data)
94{
95 struct mv_otg *mvotg = (struct mv_otg *) data;
96
97 mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
98
99 dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
100
101 if (spin_trylock(&mvotg->wq_lock)) {
102 mv_otg_run_state_machine(mvotg, 0);
103 spin_unlock(&mvotg->wq_lock);
104 }
105}
106
107static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
108{
109 struct timer_list *timer;
110
111 if (id >= OTG_TIMER_NUM)
112 return -EINVAL;
113
114 timer = &mvotg->otg_ctrl.timer[id];
115
116 if (timer_pending(timer))
117 del_timer(timer);
118
119 return 0;
120}
121
122static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
123 unsigned long interval,
124 void (*callback) (unsigned long))
125{
126 struct timer_list *timer;
127
128 if (id >= OTG_TIMER_NUM)
129 return -EINVAL;
130
131 timer = &mvotg->otg_ctrl.timer[id];
132 if (timer_pending(timer)) {
133 dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
134 return -EBUSY;
135 }
136
137 init_timer(timer);
138 timer->data = (unsigned long) mvotg;
139 timer->function = callback;
140 timer->expires = jiffies + interval;
141 add_timer(timer);
142
143 return 0;
144}
145
146static int mv_otg_reset(struct mv_otg *mvotg)
147{
148 unsigned int loops;
149 u32 tmp;
150
151 /* Stop the controller */
152 tmp = readl(&mvotg->op_regs->usbcmd);
153 tmp &= ~USBCMD_RUN_STOP;
154 writel(tmp, &mvotg->op_regs->usbcmd);
155
156 /* Reset the controller to get default values */
157 writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
158
159 loops = 500;
160 while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
161 if (loops == 0) {
162 dev_err(&mvotg->pdev->dev,
163 "Wait for RESET completed TIMEOUT\n");
164 return -ETIMEDOUT;
165 }
166 loops--;
167 udelay(20);
168 }
169
170 writel(0x0, &mvotg->op_regs->usbintr);
171 tmp = readl(&mvotg->op_regs->usbsts);
172 writel(tmp, &mvotg->op_regs->usbsts);
173
174 return 0;
175}
176
177static void mv_otg_init_irq(struct mv_otg *mvotg)
178{
179 u32 otgsc;
180
181 mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
182 | OTGSC_INTR_A_VBUS_VALID;
183 mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
184 | OTGSC_INTSTS_A_VBUS_VALID;
185
186 if (mvotg->pdata->vbus == NULL) {
187 mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
188 | OTGSC_INTR_B_SESSION_END;
189 mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
190 | OTGSC_INTSTS_B_SESSION_END;
191 }
192
193 if (mvotg->pdata->id == NULL) {
194 mvotg->irq_en |= OTGSC_INTR_USB_ID;
195 mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
196 }
197
198 otgsc = readl(&mvotg->op_regs->otgsc);
199 otgsc |= mvotg->irq_en;
200 writel(otgsc, &mvotg->op_regs->otgsc);
201}
202
203static void mv_otg_start_host(struct mv_otg *mvotg, int on)
204{
205#ifdef CONFIG_USB
206 struct usb_otg *otg = mvotg->phy.otg;
207 struct usb_hcd *hcd;
208
209 if (!otg->host)
210 return;
211
212 dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
213
214 hcd = bus_to_hcd(otg->host);
215
216 if (on)
217 usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
218 else
219 usb_remove_hcd(hcd);
220#endif /* CONFIG_USB */
221}
222
223static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
224{
225 struct usb_otg *otg = mvotg->phy.otg;
226
227 if (!otg->gadget)
228 return;
229
230 dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
231
232 if (on)
233 usb_gadget_vbus_connect(otg->gadget);
234 else
235 usb_gadget_vbus_disconnect(otg->gadget);
236}
237
238static void otg_clock_enable(struct mv_otg *mvotg)
239{
240 unsigned int i;
241
242 for (i = 0; i < mvotg->clknum; i++)
243 clk_prepare_enable(mvotg->clk[i]);
244}
245
246static void otg_clock_disable(struct mv_otg *mvotg)
247{
248 unsigned int i;
249
250 for (i = 0; i < mvotg->clknum; i++)
251 clk_disable_unprepare(mvotg->clk[i]);
252}
253
254static int mv_otg_enable_internal(struct mv_otg *mvotg)
255{
256 int retval = 0;
257
258 if (mvotg->active)
259 return 0;
260
261 dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
262
263 otg_clock_enable(mvotg);
264 if (mvotg->pdata->phy_init) {
265 retval = mvotg->pdata->phy_init(mvotg->phy_regs);
266 if (retval) {
267 dev_err(&mvotg->pdev->dev,
268 "init phy error %d\n", retval);
269 otg_clock_disable(mvotg);
270 return retval;
271 }
272 }
273 mvotg->active = 1;
274
275 return 0;
276
277}
278
279static int mv_otg_enable(struct mv_otg *mvotg)
280{
281 if (mvotg->clock_gating)
282 return mv_otg_enable_internal(mvotg);
283
284 return 0;
285}
286
287static void mv_otg_disable_internal(struct mv_otg *mvotg)
288{
289 if (mvotg->active) {
290 dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
291 if (mvotg->pdata->phy_deinit)
292 mvotg->pdata->phy_deinit(mvotg->phy_regs);
293 otg_clock_disable(mvotg);
294 mvotg->active = 0;
295 }
296}
297
298static void mv_otg_disable(struct mv_otg *mvotg)
299{
300 if (mvotg->clock_gating)
301 mv_otg_disable_internal(mvotg);
302}
303
304static void mv_otg_update_inputs(struct mv_otg *mvotg)
305{
306 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
307 u32 otgsc;
308
309 otgsc = readl(&mvotg->op_regs->otgsc);
310
311 if (mvotg->pdata->vbus) {
312 if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
313 otg_ctrl->b_sess_vld = 1;
314 otg_ctrl->b_sess_end = 0;
315 } else {
316 otg_ctrl->b_sess_vld = 0;
317 otg_ctrl->b_sess_end = 1;
318 }
319 } else {
320 otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
321 otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
322 }
323
324 if (mvotg->pdata->id)
325 otg_ctrl->id = !!mvotg->pdata->id->poll();
326 else
327 otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
328
329 if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
330 otg_ctrl->a_bus_req = 1;
331
332 otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
333 otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
334
335 dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
336 dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
337 dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
338 dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
339 dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
340 dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
341}
342
343static void mv_otg_update_state(struct mv_otg *mvotg)
344{
345 struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
346 struct usb_phy *phy = &mvotg->phy;
347 int old_state = phy->state;
348
349 switch (old_state) {
350 case OTG_STATE_UNDEFINED:
351 phy->state = OTG_STATE_B_IDLE;
352 /* FALL THROUGH */
353 case OTG_STATE_B_IDLE:
354 if (otg_ctrl->id == 0)
355 phy->state = OTG_STATE_A_IDLE;
356 else if (otg_ctrl->b_sess_vld)
357 phy->state = OTG_STATE_B_PERIPHERAL;
358 break;
359 case OTG_STATE_B_PERIPHERAL:
360 if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
361 phy->state = OTG_STATE_B_IDLE;
362 break;
363 case OTG_STATE_A_IDLE:
364 if (otg_ctrl->id)
365 phy->state = OTG_STATE_B_IDLE;
366 else if (!(otg_ctrl->a_bus_drop) &&
367 (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
368 phy->state = OTG_STATE_A_WAIT_VRISE;
369 break;
370 case OTG_STATE_A_WAIT_VRISE:
371 if (otg_ctrl->a_vbus_vld)
372 phy->state = OTG_STATE_A_WAIT_BCON;
373 break;
374 case OTG_STATE_A_WAIT_BCON:
375 if (otg_ctrl->id || otg_ctrl->a_bus_drop
376 || otg_ctrl->a_wait_bcon_timeout) {
377 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
378 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
379 phy->state = OTG_STATE_A_WAIT_VFALL;
380 otg_ctrl->a_bus_req = 0;
381 } else if (!otg_ctrl->a_vbus_vld) {
382 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
383 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
384 phy->state = OTG_STATE_A_VBUS_ERR;
385 } else if (otg_ctrl->b_conn) {
386 mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
387 mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
388 phy->state = OTG_STATE_A_HOST;
389 }
390 break;
391 case OTG_STATE_A_HOST:
392 if (otg_ctrl->id || !otg_ctrl->b_conn
393 || otg_ctrl->a_bus_drop)
394 phy->state = OTG_STATE_A_WAIT_BCON;
395 else if (!otg_ctrl->a_vbus_vld)
396 phy->state = OTG_STATE_A_VBUS_ERR;
397 break;
398 case OTG_STATE_A_WAIT_VFALL:
399 if (otg_ctrl->id
400 || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
401 || otg_ctrl->a_bus_req)
402 phy->state = OTG_STATE_A_IDLE;
403 break;
404 case OTG_STATE_A_VBUS_ERR:
405 if (otg_ctrl->id || otg_ctrl->a_clr_err
406 || otg_ctrl->a_bus_drop) {
407 otg_ctrl->a_clr_err = 0;
408 phy->state = OTG_STATE_A_WAIT_VFALL;
409 }
410 break;
411 default:
412 break;
413 }
414}
415
416static void mv_otg_work(struct work_struct *work)
417{
418 struct mv_otg *mvotg;
419 struct usb_phy *phy;
420 struct usb_otg *otg;
421 int old_state;
422
423 mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
424
425run:
426 /* work queue is single thread, or we need spin_lock to protect */
427 phy = &mvotg->phy;
428 otg = phy->otg;
429 old_state = phy->state;
430
431 if (!mvotg->active)
432 return;
433
434 mv_otg_update_inputs(mvotg);
435 mv_otg_update_state(mvotg);
436
437 if (old_state != phy->state) {
438 dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
439 state_string[old_state],
440 state_string[phy->state]);
441
442 switch (phy->state) {
443 case OTG_STATE_B_IDLE:
444 otg->default_a = 0;
445 if (old_state == OTG_STATE_B_PERIPHERAL)
446 mv_otg_start_periphrals(mvotg, 0);
447 mv_otg_reset(mvotg);
448 mv_otg_disable(mvotg);
449 break;
450 case OTG_STATE_B_PERIPHERAL:
451 mv_otg_enable(mvotg);
452 mv_otg_start_periphrals(mvotg, 1);
453 break;
454 case OTG_STATE_A_IDLE:
455 otg->default_a = 1;
456 mv_otg_enable(mvotg);
457 if (old_state == OTG_STATE_A_WAIT_VFALL)
458 mv_otg_start_host(mvotg, 0);
459 mv_otg_reset(mvotg);
460 break;
461 case OTG_STATE_A_WAIT_VRISE:
462 mv_otg_set_vbus(otg, 1);
463 break;
464 case OTG_STATE_A_WAIT_BCON:
465 if (old_state != OTG_STATE_A_HOST)
466 mv_otg_start_host(mvotg, 1);
467 mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
468 T_A_WAIT_BCON,
469 mv_otg_timer_await_bcon);
470 /*
471 * Now, we directly enter A_HOST. So set b_conn = 1
472 * here. In fact, it need host driver to notify us.
473 */
474 mvotg->otg_ctrl.b_conn = 1;
475 break;
476 case OTG_STATE_A_HOST:
477 break;
478 case OTG_STATE_A_WAIT_VFALL:
479 /*
480 * Now, we has exited A_HOST. So set b_conn = 0
481 * here. In fact, it need host driver to notify us.
482 */
483 mvotg->otg_ctrl.b_conn = 0;
484 mv_otg_set_vbus(otg, 0);
485 break;
486 case OTG_STATE_A_VBUS_ERR:
487 break;
488 default:
489 break;
490 }
491 goto run;
492 }
493}
494
495static irqreturn_t mv_otg_irq(int irq, void *dev)
496{
497 struct mv_otg *mvotg = dev;
498 u32 otgsc;
499
500 otgsc = readl(&mvotg->op_regs->otgsc);
501 writel(otgsc, &mvotg->op_regs->otgsc);
502
503 /*
504 * if we have vbus, then the vbus detection for B-device
505 * will be done by mv_otg_inputs_irq().
506 */
507 if (mvotg->pdata->vbus)
508 if ((otgsc & OTGSC_STS_USB_ID) &&
509 !(otgsc & OTGSC_INTSTS_USB_ID))
510 return IRQ_NONE;
511
512 if ((otgsc & mvotg->irq_status) == 0)
513 return IRQ_NONE;
514
515 mv_otg_run_state_machine(mvotg, 0);
516
517 return IRQ_HANDLED;
518}
519
520static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
521{
522 struct mv_otg *mvotg = dev;
523
524 /* The clock may disabled at this time */
525 if (!mvotg->active) {
526 mv_otg_enable(mvotg);
527 mv_otg_init_irq(mvotg);
528 }
529
530 mv_otg_run_state_machine(mvotg, 0);
531
532 return IRQ_HANDLED;
533}
534
535static ssize_t
536get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
537{
538 struct mv_otg *mvotg = dev_get_drvdata(dev);
539 return scnprintf(buf, PAGE_SIZE, "%d\n",
540 mvotg->otg_ctrl.a_bus_req);
541}
542
543static ssize_t
544set_a_bus_req(struct device *dev, struct device_attribute *attr,
545 const char *buf, size_t count)
546{
547 struct mv_otg *mvotg = dev_get_drvdata(dev);
548
549 if (count > 2)
550 return -1;
551
552 /* We will use this interface to change to A device */
553 if (mvotg->phy.state != OTG_STATE_B_IDLE
554 && mvotg->phy.state != OTG_STATE_A_IDLE)
555 return -1;
556
557 /* The clock may disabled and we need to set irq for ID detected */
558 mv_otg_enable(mvotg);
559 mv_otg_init_irq(mvotg);
560
561 if (buf[0] == '1') {
562 mvotg->otg_ctrl.a_bus_req = 1;
563 mvotg->otg_ctrl.a_bus_drop = 0;
564 dev_dbg(&mvotg->pdev->dev,
565 "User request: a_bus_req = 1\n");
566
567 if (spin_trylock(&mvotg->wq_lock)) {
568 mv_otg_run_state_machine(mvotg, 0);
569 spin_unlock(&mvotg->wq_lock);
570 }
571 }
572
573 return count;
574}
575
576static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
577 set_a_bus_req);
578
579static ssize_t
580set_a_clr_err(struct device *dev, struct device_attribute *attr,
581 const char *buf, size_t count)
582{
583 struct mv_otg *mvotg = dev_get_drvdata(dev);
584 if (!mvotg->phy.otg->default_a)
585 return -1;
586
587 if (count > 2)
588 return -1;
589
590 if (buf[0] == '1') {
591 mvotg->otg_ctrl.a_clr_err = 1;
592 dev_dbg(&mvotg->pdev->dev,
593 "User request: a_clr_err = 1\n");
594 }
595
596 if (spin_trylock(&mvotg->wq_lock)) {
597 mv_otg_run_state_machine(mvotg, 0);
598 spin_unlock(&mvotg->wq_lock);
599 }
600
601 return count;
602}
603
604static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
605
606static ssize_t
607get_a_bus_drop(struct device *dev, struct device_attribute *attr,
608 char *buf)
609{
610 struct mv_otg *mvotg = dev_get_drvdata(dev);
611 return scnprintf(buf, PAGE_SIZE, "%d\n",
612 mvotg->otg_ctrl.a_bus_drop);
613}
614
615static ssize_t
616set_a_bus_drop(struct device *dev, struct device_attribute *attr,
617 const char *buf, size_t count)
618{
619 struct mv_otg *mvotg = dev_get_drvdata(dev);
620 if (!mvotg->phy.otg->default_a)
621 return -1;
622
623 if (count > 2)
624 return -1;
625
626 if (buf[0] == '0') {
627 mvotg->otg_ctrl.a_bus_drop = 0;
628 dev_dbg(&mvotg->pdev->dev,
629 "User request: a_bus_drop = 0\n");
630 } else if (buf[0] == '1') {
631 mvotg->otg_ctrl.a_bus_drop = 1;
632 mvotg->otg_ctrl.a_bus_req = 0;
633 dev_dbg(&mvotg->pdev->dev,
634 "User request: a_bus_drop = 1\n");
635 dev_dbg(&mvotg->pdev->dev,
636 "User request: and a_bus_req = 0\n");
637 }
638
639 if (spin_trylock(&mvotg->wq_lock)) {
640 mv_otg_run_state_machine(mvotg, 0);
641 spin_unlock(&mvotg->wq_lock);
642 }
643
644 return count;
645}
646
647static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
648 get_a_bus_drop, set_a_bus_drop);
649
650static struct attribute *inputs_attrs[] = {
651 &dev_attr_a_bus_req.attr,
652 &dev_attr_a_clr_err.attr,
653 &dev_attr_a_bus_drop.attr,
654 NULL,
655};
656
657static struct attribute_group inputs_attr_group = {
658 .name = "inputs",
659 .attrs = inputs_attrs,
660};
661
662int mv_otg_remove(struct platform_device *pdev)
663{
664 struct mv_otg *mvotg = platform_get_drvdata(pdev);
665
666 sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
667
668 if (mvotg->qwork) {
669 flush_workqueue(mvotg->qwork);
670 destroy_workqueue(mvotg->qwork);
671 }
672
673 mv_otg_disable(mvotg);
674
675 usb_remove_phy(&mvotg->phy);
676 platform_set_drvdata(pdev, NULL);
677
678 return 0;
679}
680
681static int mv_otg_probe(struct platform_device *pdev)
682{
683 struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
684 struct mv_otg *mvotg;
685 struct usb_otg *otg;
686 struct resource *r;
687 int retval = 0, clk_i, i;
688 size_t size;
689
690 if (pdata == NULL) {
691 dev_err(&pdev->dev, "failed to get platform data\n");
692 return -ENODEV;
693 }
694
695 size = sizeof(*mvotg) + sizeof(struct clk *) * pdata->clknum;
696 mvotg = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
697 if (!mvotg) {
698 dev_err(&pdev->dev, "failed to allocate memory!\n");
699 return -ENOMEM;
700 }
701
702 otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
703 if (!otg)
704 return -ENOMEM;
705
706 platform_set_drvdata(pdev, mvotg);
707
708 mvotg->pdev = pdev;
709 mvotg->pdata = pdata;
710
711 mvotg->clknum = pdata->clknum;
712 for (clk_i = 0; clk_i < mvotg->clknum; clk_i++) {
713 mvotg->clk[clk_i] = devm_clk_get(&pdev->dev,
714 pdata->clkname[clk_i]);
715 if (IS_ERR(mvotg->clk[clk_i])) {
716 retval = PTR_ERR(mvotg->clk[clk_i]);
717 return retval;
718 }
719 }
720
721 mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
722 if (!mvotg->qwork) {
723 dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
724 return -ENOMEM;
725 }
726
727 INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
728
729 /* OTG common part */
730 mvotg->pdev = pdev;
731 mvotg->phy.dev = &pdev->dev;
732 mvotg->phy.otg = otg;
733 mvotg->phy.label = driver_name;
734 mvotg->phy.state = OTG_STATE_UNDEFINED;
735
736 otg->phy = &mvotg->phy;
737 otg->set_host = mv_otg_set_host;
738 otg->set_peripheral = mv_otg_set_peripheral;
739 otg->set_vbus = mv_otg_set_vbus;
740
741 for (i = 0; i < OTG_TIMER_NUM; i++)
742 init_timer(&mvotg->otg_ctrl.timer[i]);
743
744 r = platform_get_resource_byname(mvotg->pdev,
745 IORESOURCE_MEM, "phyregs");
746 if (r == NULL) {
747 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
748 retval = -ENODEV;
749 goto err_destroy_workqueue;
750 }
751
752 mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
753 if (mvotg->phy_regs == NULL) {
754 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
755 retval = -EFAULT;
756 goto err_destroy_workqueue;
757 }
758
759 r = platform_get_resource_byname(mvotg->pdev,
760 IORESOURCE_MEM, "capregs");
761 if (r == NULL) {
762 dev_err(&pdev->dev, "no I/O memory resource defined\n");
763 retval = -ENODEV;
764 goto err_destroy_workqueue;
765 }
766
767 mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
768 if (mvotg->cap_regs == NULL) {
769 dev_err(&pdev->dev, "failed to map I/O memory\n");
770 retval = -EFAULT;
771 goto err_destroy_workqueue;
772 }
773
774 /* we will acces controller register, so enable the udc controller */
775 retval = mv_otg_enable_internal(mvotg);
776 if (retval) {
777 dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
778 goto err_destroy_workqueue;
779 }
780
781 mvotg->op_regs =
782 (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
783 + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
784
785 if (pdata->id) {
786 retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
787 NULL, mv_otg_inputs_irq,
788 IRQF_ONESHOT, "id", mvotg);
789 if (retval) {
790 dev_info(&pdev->dev,
791 "Failed to request irq for ID\n");
792 pdata->id = NULL;
793 }
794 }
795
796 if (pdata->vbus) {
797 mvotg->clock_gating = 1;
798 retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
799 NULL, mv_otg_inputs_irq,
800 IRQF_ONESHOT, "vbus", mvotg);
801 if (retval) {
802 dev_info(&pdev->dev,
803 "Failed to request irq for VBUS, "
804 "disable clock gating\n");
805 mvotg->clock_gating = 0;
806 pdata->vbus = NULL;
807 }
808 }
809
810 if (pdata->disable_otg_clock_gating)
811 mvotg->clock_gating = 0;
812
813 mv_otg_reset(mvotg);
814 mv_otg_init_irq(mvotg);
815
816 r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
817 if (r == NULL) {
818 dev_err(&pdev->dev, "no IRQ resource defined\n");
819 retval = -ENODEV;
820 goto err_disable_clk;
821 }
822
823 mvotg->irq = r->start;
824 if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
825 driver_name, mvotg)) {
826 dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
827 mvotg->irq);
828 mvotg->irq = 0;
829 retval = -ENODEV;
830 goto err_disable_clk;
831 }
832
833 retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
834 if (retval < 0) {
835 dev_err(&pdev->dev, "can't register transceiver, %d\n",
836 retval);
837 goto err_disable_clk;
838 }
839
840 retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
841 if (retval < 0) {
842 dev_dbg(&pdev->dev,
843 "Can't register sysfs attr group: %d\n", retval);
844 goto err_remove_phy;
845 }
846
847 spin_lock_init(&mvotg->wq_lock);
848 if (spin_trylock(&mvotg->wq_lock)) {
849 mv_otg_run_state_machine(mvotg, 2 * HZ);
850 spin_unlock(&mvotg->wq_lock);
851 }
852
853 dev_info(&pdev->dev,
854 "successful probe OTG device %s clock gating.\n",
855 mvotg->clock_gating ? "with" : "without");
856
857 return 0;
858
859err_remove_phy:
860 usb_remove_phy(&mvotg->phy);
861err_disable_clk:
862 mv_otg_disable_internal(mvotg);
863err_destroy_workqueue:
864 flush_workqueue(mvotg->qwork);
865 destroy_workqueue(mvotg->qwork);
866
867 platform_set_drvdata(pdev, NULL);
868
869 return retval;
870}
871
872#ifdef CONFIG_PM
873static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
874{
875 struct mv_otg *mvotg = platform_get_drvdata(pdev);
876
877 if (mvotg->phy.state != OTG_STATE_B_IDLE) {
878 dev_info(&pdev->dev,
879 "OTG state is not B_IDLE, it is %d!\n",
880 mvotg->phy.state);
881 return -EAGAIN;
882 }
883
884 if (!mvotg->clock_gating)
885 mv_otg_disable_internal(mvotg);
886
887 return 0;
888}
889
890static int mv_otg_resume(struct platform_device *pdev)
891{
892 struct mv_otg *mvotg = platform_get_drvdata(pdev);
893 u32 otgsc;
894
895 if (!mvotg->clock_gating) {
896 mv_otg_enable_internal(mvotg);
897
898 otgsc = readl(&mvotg->op_regs->otgsc);
899 otgsc |= mvotg->irq_en;
900 writel(otgsc, &mvotg->op_regs->otgsc);
901
902 if (spin_trylock(&mvotg->wq_lock)) {
903 mv_otg_run_state_machine(mvotg, 0);
904 spin_unlock(&mvotg->wq_lock);
905 }
906 }
907 return 0;
908}
909#endif
910
911static struct platform_driver mv_otg_driver = {
912 .probe = mv_otg_probe,
913 .remove = __exit_p(mv_otg_remove),
914 .driver = {
915 .owner = THIS_MODULE,
916 .name = driver_name,
917 },
918#ifdef CONFIG_PM
919 .suspend = mv_otg_suspend,
920 .resume = mv_otg_resume,
921#endif
922};
923module_platform_driver(mv_otg_driver);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-04 12:15:02 -0500